Current type 4-20 signal output carbon dioxide sensor transmitter controller
Scope of use
The current type 4-20 signal output carbon dioxide sensor transmitter controller is mainly designed for environmental detection and control of agricultural greenhouses and intelligent agriculture. It can be used in various factory workshops, purification rooms, laboratories, computer rooms, office and commercial buildings, airports, stations, museums, stadiums, agricultural greenhouses, etc. where it is necessary to detect and control indoor air quality.
Main features of current type 4-20 signal output carbon dioxide sensor transmitter controller
â— High-performance NDIR digital sensors and circuits for accurate measurement and temperature compensation
â— Good long-term stability and reliability
â— Sensor is longer than 15 years, maintenance free
â— quick response
â— Lightweight shell, beautiful and easy to install
â— Multiple output options are available
â— With MMI, it has a variety of parameter setting, modification, correction functions, and can achieve independent control functions.
Optional LCD display module: can be ordered separately and installed on site. See the MMI series operator panel manual for details.
Optional MMI operator panel: Includes LCD and function keys for independent ordering and field installation. See the MMI series operator panel manual for details.
Technical indicators
Sensor NDIR sensor with ABC self-checking function
Measuring principle active gas diffusion
See the selection table for accuracy
Response time <10s (30cc/min, slow flow rate air)
Drift <±10ppm/year
Range 0~2000ppm, or other (0~5000ppm)
Output 4~20mA, 0~10V, RS485/Modbus
Relay 2×SPST, 1A/30VDC, 0.5A/125VAC
Load ≤600Ω (current), ≥2KΩ (voltage)
Power supply 18~30VAC/DC
Display large screen LCD digital display (CDW optional)
Display accuracy 1ppm
Working environment 0~50°C, 0~95% RH (non-condensing)
Storage and transportation temperature -20~80°C
Shell material fireproof ABS
Protection class IP65
Current type 4-20 signal output carbon dioxide sensor transmitter controller wall mounted installation instructions
â— When the wall is installed, the bottom box should be close to the wall and installed vertically. Keep away from cold, hot and humid sources.
â— When taking the cover of the mounting box, press firmly on the side of the buckle to pull it outward, or use a flat-blade screwdriver to gently twist at the buckle.
â— Pull the cable out of the bottom box hole and install the transmitter vertically on the standard electrical back box with the two M4*25 screws provided in the accessory (the back box is usually pre-buried in the wall).
â— Wire the cable according to the wiring diagram and install the top cover.
Pipeline installation instructions
â— It should be ensured that the direction of the airflow in the duct is consistent with the direction indicated by the upper cover.
â— Drill a hole with a diameter of 32mm and three diameters of 3mm on the pipe, put the gasket on the probe, insert the probe into the air duct, and then fasten the bottom box to the pipe with the provided 3 screws. on. Make sure all mounting holes are well sealed during installation.
â— Open the upper cover and connect the necessary wiring. After the wiring is taken out from the cable head, lock the cable head and finally install the upper cover.
â— Due to possible negative pressure, ambient air must be prevented from being drawn into the mounting box. Therefore, it is necessary to ensure the sealing of the upper cover and the bottom box, the sealing of the cable head and the bottom box, and the sealing of the lead and the cable head. This is the only way to ensure that air enters the mounting box is the probe. At the same time, the overall installation box can be sealed to IP65.
Current type 4-20 signal output carbon dioxide sensor transmitter controller
Precautions
â— Not suitable for use in high SO2 environments. â— In normal application environments, the accuracy of the technical description can only be achieved after the sensor has been in operation for at least 3 weeks. (Consider the effects of factory calibration and actual measurement gas error). â— Power off operation during installation and wiring. When using a 24VAC power supply, a separate transformer is recommended. When sharing a 24VAC transformer with equipment such as other controllers, transmitters or valve actuators, ensure that the polarity (24V and GND) connections are correct, otherwise unpredictable conditions may be caused and even damage to these devices.
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